【Swift 60秒】04 - Doubles and booleans

0x00 Lesson

Two other basic types of data in Swift are doubles and booleans, and you’ll be using them a lot.

Double is short for double-precision floating-point number , and it’s a fancy way of saying it holds fractional values such as 38.1, or 3.141592654.

Whenever you create a variable with a fractional number, Swift automatically gives that variable the type Double.
For example:

var pi = 3.141
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Doubles are different from integers, and you can't mix them by accident.

As for booleans, they are much simpler: they just hold either true or false, and Swift will automatically assign the boolean type to any variable assigned either true or false as its value.
For example:

var awesome = true
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0x01 Tips

You will sometimes see another type called Float. This is similar to Double, but is less accurate beacuse it uses less storage to store numbers.

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0x02 我的小作品

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